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|  DSH 716
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| Probe impedance for plug discharge test _; `8 \5 w2 B$ |- s( B9 s
| 9.1.6 (IEC 60065) 22.5 (IEC 60335) 2.1.1.7 (IEC 60950) 6.1.2, 6.10.3 (IEC 61010) + any other as applicable
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Question: a! `' h% f5 i+ C7 t. `
When the plug discharge test is performed using a voltage probe and oscilloscope for direct measurement of the voltage decay, what probe impedance shall be used to ensure uniform and comparable results?
2 r% \$ a: p( ^, {" dNote: IEC 60950-1/2005 specifies 100 M ± 5 M in parallel with an input capacitance of 20pF ± 5 pF.( P/ F7 D, z1 V2 k: u7 ~
Decision:/ B n; U. Y4 u7 L+ u
If the relevant standard does not contain contradictory requirements, a voltage probe having an input impedance of 100 M or greater in parallel with an input capacitance of 25 pF or less, shall be used for this test., {0 T% ?( e C9 w9 v/ C B' z l0 D+ M
For other (automatic) equipment with special measurement techniques equivalent measures shall be taken to ensure comparable results.4 Y, b+ u! h: U5 K% P! l
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发表于 2012-9-8 13:00
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